Hidden hazard is a term used to describe a potential danger that is not immediately visible or known. The three crossword solutions for this term are PITFALL (7 letters), TRAP (4 letters), and Boobytrap (9 letters). A PITFALL is a hidden or unsuspected danger or difficulty. A TRAP is a device or enclosure designed to catch and retain animals, typically by allowing entry but not exit. A boobytrap is an explosive device or other TRAP set to act when disturbed or activated by an unsuspecting person.